SU1124502A1 - Cutter tool - Google Patents

Abstract

A CUTTER with an Archimedean screw front surface with a main and auxiliary cutting edges and with a variable rake angle, with the fact that in order to increase the reliability of chip splitting, the rake angle is moving away from. the tips of the cutter are reduced along the cutting edges, and the chamfer is made along the main cutting edge. u 4 sd o to

Description

The invention relates to the field of pbrah) cutting plastic metals and alloys on rpyniiht turning machines and can be used on computer-controlled machines.

Known tokarn1z; e carved, providing crushing chips by sharpening str, zakozavivayuykh ledges, thresholds, grooves, holes, or equipped with overlap;

A common feature of all the incisors designed for crushing chips is the tendency to bend (curl) about an axis parallel to the larger side of the cross section 5 of the chip, which ensures that the chip curls in the plane of its most compactness. In this case, if the chips are not crushed into part of the ring, it is formed in the form of a cylindrical spiral, the length of which is not limited by anything. Such shavings, especially with significant helix diameters, are prone to becoming confused C1p ocr. work with which is almost impossible 5 because it is necessary to interrupt the cutting process to remove chips.

A cutter is known that provides for curling of chips, the specific feature of which the non-irregular surface is made is that the rake angle of the cutter smoothly or stepwise increases with distance from the tip of the cutter along the main cutting edge.

However, this cutter curls the shavings 3 of the plane of its lowest rigidity, which does not guarantee crushing chips; besides, it is not intended to work with cross feed.

To give an invention - increasing the reliability of splitting chips during longitudinal and transverse turning,

The goal is achieved in the cutter with an Archimedean helical front piece with the main and auxiliary edges and with the angle between it and the corner, the latter decreases along the leading edges along the leading edge, and along the main cutting edge 1-1Ki: the chamfer of the cutter. ,

Ma FIG. I shows a diagram of the formation of the front surface of the cutter; in FIG. 2 a proposed cutter, the plan in FIG. 3 is a view A-A in FIG. 2; in fig. 4 is a view of BB of FIG. 2; on

45022

FIG. 5 is a view B-B in FIG. 2; in fig. 6 is a view of YY of FIG. 2; in fig. 7 is a diagram of the work of the proposed cutter with longitudinal turning; in FIG. 8, the same with cross turning.

The surface of the direct helicopter AdAVB, (Fig. 1), is formed as a geometric location producing an optic current AB, perpendicular to the axis O, when it rotates uniformly about the axis 0 and simultaneously moves along this axis.

Helicoid equation in parametric form:

X p cos (/ y -0), ° sin (,

where f is the angle between the generating point 0moy in its initial position AO BO and the plane XOY; 9 - the current angle of rotation of the production line; p is the variable radius of the point on the top.

Attached to the proposed cutter;

 - front surface

cutter; 0 - his main cutting

edge; ADVD - auxiliary cutting

edge.

The rake angle along the main cutting edge, measured in planes 5 parallel to the ZOX plane, will be determined at each point and will continuously decrease from the point AO to point A, taking negative values at ©. The rake angle along the minor cutting edge, measured in the plane parallel to the plane YOZ, also gradually decreases from the zero value at the point Ad from the point Bj, increasing numerically, but remaining negative along the entire edge.

In accordance with this, in section A-A and BB, shown in FIGS. 3, 4, the main rake angle and the auxiliary rake angle V V

The angle on the chamfer i also decreases from the tip of the cutter. The width of the chamfer is set equal to the thickness of the cutting layer,

5 When machining steel 45, reliable crushing of chips in both the longitudinal and transverse currents was ensured by a chisel cutter

parameter, starting rake angle). The value of the rake angle along the main and auxiliary cutting edges is presented in the table.

"-15

O +9.27 -5

+3.54

-10 -2.19 -15 -7.92 -20

In a wide range of cutting conditions, both with longitudinal and lateral turning, chips are formed in the plane of its greatest rigidity and are crushed into parts of the ring, resting against the surface 2 to be machined; no chips come into contact with the surface 3.

When operating with the proposed cutter, machine failures are excluded which are associated with the unfavorable shape of chips when operating under automated production conditions; the defect due to chips damage on the treated surface of the product is eliminated.

gd

Ф14г.7

Claims (1)

CUTTER with an Archimedean helical front surface with a primary and secondary cutting edges and with a variable rake angle, characterized in that, in order to increase the chip crushing reliability, the rake angle is away from. the tip of the cutter along the cutting edges decreases, and a helical chamfer is made along the main cutting edge. FIG. 1 1 124502